Optical system

Abstract

The present disclosure provides an optical system including a TIR mother lens and a secondary output lens, preferably for efficiently distributing light out of an LED track lighting system. The optical system of the present disclosure is configured to create variant beam angles from a lens assembly using the same TIR lens. Preferably, by altering the dimensions and focal lengths of the secondary output lens in a single TIR lens, the optical system can create a variety of beam angles, including, but not limited to, Spot (“SP”), Narrow Flood (“NFL”), Flood (“FL”), or Wide Flood (“WFL”) beam angles.

What is claimed is: 
     
       1. An optical system, comprising:
 a TIR lens having a first end having a first diameter, a second end having a second diameter larger than the first diameter, an outer tapering peripheral wall connecting the first end and the second end, and an inner peripheral wall defining a cavity through a central region of the TIR lens from the first end to the second end and defining a first opening in the first end of the TIR lens and a second opening in the second end of the TIR lens, the TIR lens being configured to refract light from a light source near the first end of the TIR lens; 
 a plurality of interchangeable secondary lenses, wherein each of said secondary lenses is configured to be removably disposed at least partially over the second end of the TIR lens and be removably attached to the TIR lens, each of said secondary lenses being configured to redirect the light passing through the secondary lens; and 
 a third lens removably disposed within the cavity of the TIR lens; 
 wherein the plurality of interchangeable secondary lenses comprises:
 a lens configured to result in a beam angle of 0 to 17 degrees; 
 a lens configured to result in a beam angle of 18 to 25 degrees; 
 a lens configured to result in a beam angle of 26 to 39 degrees; and 
 a lens configured to result in a beam angle of 40 degrees or greater. 
 
 
     
     
       2. The optical system of  claim 1 , wherein the third lens includes a concave face and a flat, planar face. 
     
     
       3. The optical system of  claim 2 , wherein the concave face faces toward the second end of the TIR lens. 
     
     
       4. The optical system of  claim 1 , wherein the secondary lens and third lens are coaxially co-located with the TIR lens. 
     
     
       5. The optical system of  claim 1 , wherein the secondary lens is a Fresnel lens. 
     
     
       6. The optical system of  claim 1 , wherein the secondary lens is a micro lens. 
     
     
       7. A light fixture comprising the optical system of  claim 1  disposed in a housing, the light fixture further comprising an operable LED light source disposed proximate a central region of the first end of the TIR lens. 
     
     
       8. The optical system of  claim 1 , wherein the TIR lens is annularly shaped and defines a patterned surface portion at its distal end for redirecting light passing therethrough. 
     
     
       9. The optical system of  claim 1 , wherein the plurality of secondary lenses each comprises a different diameter, focal length and surface geometry. 
     
     
       10. An optical system, comprising:
 a TIR lens having a first end having a first diameter, a second end having a second diameter larger than the first diameter, an outer tapering peripheral wall connecting the first end and the second end, and an inner peripheral wall defining a cavity through a central region of the TIR lens from the first end to the second end and defining a first opening in the first end of the TIR lens and a second opening in the second end of the TIR lens, the TIR lens being configured to refract light from a light source near the first end of the TIR lens; 
 a plurality of interchangeable secondary lenses, wherein each of said secondary lenses is configured to be removably disposed at least partially over the second end of the TIR lens and be removably attached to the TIR lens, each of said secondary lenses being configured to redirect the light passing through the secondary lens; and 
 an insertable opaque shield disposed within the cavity of the TIR lens; 
 wherein the plurality of interchangeable secondary lenses comprises:
 a lens configured to result in a beam angle of 0 to 17 degrees; 
 a lens configured to result in a beam angle of 18 to 25 degrees; 
 a lens configured to result in a beam angle of 26 to 39 degrees; and 
 a lens configured to result in a beam angle of 40 degrees or greater. 
 
 
     
     
       11. A light fixture comprising the optical system of  claim 10  disposed in a housing, the light fixture further comprising an operable LED light source disposed proximate a central region of the first end of the TIR lens. 
     
     
       12. The optical system of  claim 10 , wherein the TIR lens is annularly shaped and defines a patterned surface portion at its distal end for redirecting light passing therethrough. 
     
     
       13. The optical system of  claim 10 , wherein the plurality of secondary lenses each comprises a different diameter, focal length and surface geometry.